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<h2>Cac lop co so .NET</h2>

Tieu chuan ECMA
	nhung doi tuong chuan hoa duoc viet trong namespace System.
	Nhung namespace khac chua nhung lop khong duoc chuan hoa
	Neu 1 lop ko phai la 1 phan cua tieu chuan no se khong ho tro tren tat ca
	cac he dieu hanh va ma moi truong ma chung duoc viet de ho tro
	thu thi C#

Lop Timer

Lop Environtment
	lop ve thu muc va he thong
Lop Math
	ham toan hoc
Lop File
	tho atac tap tin
	mo, dong, ghi, doc file van ban, file nhi phan
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